-180mm lightweight aluminium multi function rafter square. -180mm lightweight aluminium multi-function rafter square -All-in-one tool: ruler, tri-square, mitre square, angle gauge, drilling & sawing guide, rafter angle measurer -End stop for quick and accurate 90° & 45° markings -High-contrast graduations for easy reading in any light -Includes metric, HIP-VAL, degree scales and rafter conversion chart -Compact, durable and designed for professional use